Rope tightener



FIG. 1 is a perspective view of a rope tightener showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

The left side is a mirror image of the right side;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a rope tightener, as shown, and described. 